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I can confirm that additives are a scam in itself. Pump your tank, both compartments if you live in a state that requires two conpartment septic tanks, and be sure that ALL the solids are removed...

New hot water heater was installed about 17 months ago. I think I mis-stated that date earlier.

Yes, it was significant but also spotty in the locations. I assumed that the constant recirculation...

It was a bad check valve.

Just finished for the night.

Short answer, bad check valve between cold water and hot water. I could blow air in both directions through it.

Long explanation tomorrow.

Removed all the...

Off to Lowe's. Wish me luck.


Just for kicks, can someone explain why this would cause the awful banging noise?

Yes, I am positive. That is just a shut off going into the hot water heater. I can take a photo but trust me, the thermal expansion tank is in the loop.

I don't believe the PRV prevents water from flowing backwards through it.

However, the utility has an independent A.Y. McDonald true double check valve at the meter (on the line setter) which...

To be honest, I can't remember and I recycled it several months ago.

Even though we have figured out that my TE tank is in the loop, which means that it is not working at all since it is not...

We posted at nearly the same time.

Also, above when I said removal I meant relocation.

But yes, you are correct, the TE tank is in the hot water loop.

This must be what is happening:
...

I think I found what you thought looked wrong.

My thermal expansion tank is in the loop!

There is a check valve preventing hot water from flowing back into the cold water.

This may explain...

The tank has a bladder. No doubt about it. I had the same model before and I cut it open to see for myself when the last one failed.

What does not look right in my installation?

Yes, I have a...

Below you see the setup. Incoming from right to left in photo. The thermal expansion tank is within three line feet of hot water heater in one of two approved positions per instructions....

Regarding where we believe the vibration is the strongest. My wife and I debate this so here is the low down.

She believes is the part of the house that is over the current hot water heater...

I have a Watts 25AUB PRV in case it matters. That was also the previous model I had before changing out the new one a few weeks back.

Let me correct one thing, our pressure inside the house is at...

I will try partially closing the main shut off valve we have inside our home. We ruled out the PRV by changing it. They normally give a humming sound when bad.

I am up for anything these days...

I have copper lines in our house. Walk out basement with living space above. House was finished in 2003.

I have a hot water circulating pump to keep the water warm in the hot line for fast hot...